<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" title="黑马头条">
      <van-icon
        slot="left"
        class="van-icon"
        name="arrow-left"
        @click="$router.back()"
      />
    </van-nav-bar>

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>

          <!-- 封装关注，取消关注组件 -->
          <followedUser
            v-model="article.is_followed"
            :followedId="article.aut_id"
            class="follow-btn"
          ></followedUser>
          <!-- 封装关注，取消关注组件 -->
        </van-cell>

        <!-- 文章内容 -->
        <div
          ref="article-content"
          class="article-content markdown-body"
          v-html="article.content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 评论区域 -->
        <commentList
          :CommentId="article.art_id"
          @onload-success="totalCommentCount = $event.total_count"
          :list="commentlist"
          @hf="onhuifu"
        ></commentList>
      </div>

      <!-- 加载失败：404 -->
      <div v-else-if="status === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click="loadArticle" class="retry-btn">点击重试</van-button>
      </div>
    </div>

    <!-- 底部区域 -->
    <div class="article-bottom" v-if="article.title">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="isshow = true"
        >写评论</van-button
      >
      <van-icon name="comment-o" :info="totalCommentCount" color="#777" />

      <!-- 收藏功能 -->
      <collections
        class="btn-item"
        v-model="article.is_collected"
        :articleID="article.art_id"
      ></collections>

      <!-- 点赞功能 -->
      <likeArticle
        v-model="article.attitude"
        :articleId="article.art_id"
      ></likeArticle>
      <van-icon name="share" color="#777777"></van-icon>
    </div>

    <!-- 发布评论弹出层 -->
    <van-popup v-model="isshow" position="bottom">
      <commentPost :commentId="article.art_id" @down="updatepl"></commentPost>
    </van-popup>
    <!-- 发布评论弹出层 -->

    <!-- 回复弹出层 -->
    <van-popup v-model="show" position="bottom" :style="{ height: '100%' }">
      <commentReply v-if="show" :currentComment="currentComment" @close="show = false"></commentReply>
    </van-popup>
    <!-- 回复弹出层 -->
  </div>
</template>

<script>
import { getArticleById } from "@/api/article.js";
import { ImagePreview } from "vant";
import followedUser from "../../components/followed-user.vue";
import collections from "../../components/collections.vue";
import likeArticle from "../../components/like-article.vue";
import commentList from "../../components/comment-list.vue";
import commentPost from "../../components/comment-post.vue";
import commentReply from  "../../components/comment-reply.vue";
export default {
  name: "ArticleIndex",
  components: {
    followedUser,
    collections,
    likeArticle,
    commentList,
    commentPost,
    commentReply,
  },
  data() {
    return {
      article: {}, //储存文章的数据
      loading: true, //默认加载中的状态
      status: 0, //默认状态为0
      loading: false, //加中状态
      totalCommentCount: 0, 
      isshow: false, //评论弹出层状态
      commentlist:[], //评论类表
      show:false,  //回复弹出层
      currentComment:{}, // 点击当前回复的评论
    };
  },
  //给所有的后代组价传递数据
  provide:function(){
   return {
    articleId:this.articleId
   }
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true,
    },
  },
  created() {
    
  },
  activated(){
    this.loadArticle(); //调用methods中的函数
},
  methods: {
    async loadArticle() {
      this.loading = true;
      try {
        const { data } = await getArticleById(this.articleId);
        /*  console.log(data); */
        if (Math.random() > 0.5) {
          JSON.parse("dkjghkjhghkdghskio"); //随机报错器
        }

        this.article = data.data;
        /*    console.log(this.article); */

        setTimeout(() => {
          this.previewImage();
        }, 0);
      } catch (error) {
        if (error.response && error.response.status === 404) {
          this.status = 404;
        }
      }
      this.loading = false;
    },
    previewImage() {
      // 得到所有的 img 节点
      const articleContent = this.$refs["article-content"];
      const imgs = articleContent.querySelectorAll("img");
      const images = [];

      imgs.forEach((item, index) => {
        images.push(item.src);

        item.onclick = () => {
          ImagePreview({
            images,
            startPosition: index,
          });
        };
      });
    },
    updatepl(data){
    this.isshow =false,
   this.commentlist.unshift(data.new_obj)
    },
    onhuifu(comment){
      this.show =true
      this.currentComment =comment
    }
  },
};
</script>

<style scoped lang="less">
@import "../../components/github-markdown.css";
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>